Stable hydrogen peroxid and method of making the same.



' the stability of hydrogen ALors scnz'e'rnn'eur, or mennrorr-on-rnn-Mam, GERMANY, assrenoe. T0 nonssrnn e Hesse-anneal enhancer. co, or new YORK, n. Y.

STEELE EYIFROGEN PERQXID'AND METHGD 0F MAKING THE SAME.

Lease. No Brewing.

To all whom it may concern Be it knownthat l, ALoIs SGHAIDHAUF,

a subject of the Emperor of Germany, and

resident of Frankfort o. M. Germany, have invented certain new and useful Improvemerits in St s Hydrogen Peroxid and Methods of following is a spe This invention to a stable hydrogen peroxid and method of making the same.

The solution of pi is very important as hydi V lutions are used for many industrial purposes. Though a great many chemicals have been suggested their stabilising efiert on the liydrogen-peroxid has not been lasting enough and such solutions neither proved economical in their application nor could they be stored for a great length of time Without sustaining losses. lhe most reliable agent to prevent the solution, When from undergoing decomposition is v addition of some acid as for instance, sulfuric acid, phosphoric acid, etc; but the application of hydrogen-peroxid for many purposes, especially for bleaching processes, demands an alkaline reaction and in this case much active oxygen escapes unused into the air.

I have discovered a process for n'lanufacturing alkaline as Well as neutral solutions containing free hydrogen perm-rid or such in the latent form of a perborate, Whichhave excellent properties inasmuch as their available oxygen very ellectivcly used and as there are practically no losses of oxygen, even it the solutions are stored for a considerable length of time. This new process is based on the observation of the most-sun prising fact that solutions containing active oxygen attain a very satisfactory stability on the addition of an insoluble aluminiumcompound as for instance, aluminium-hydroXid, aluminium-oxid, aluminium-silicate,

. etc, said insoluble illdil'llllllll'II-COITI ound being preferably in a very finely divided state. The following example serves to illustrate of hydrogen-peroxid contain line-tel alum is treated with Specification of Letters Patent.

Patented Aug. 13, 1918.

Application filed August 2, 1912, Serial No, 712,852.

'method, is dependent on the presence of an insoluble aluminiunvcompound, as is convincingly proved by the following experiment:

The hydrogen-peroxid solution with the finely divided insoluble alun1iniuni-hydroX- id suspended in it is stirred until the precipitate is evenly distributed all through the liquid and the liquid is then divided into two equal portions. Un'e portion is deprived es of the PFQUlj'JlifilQ by filtering oil the same, whereas the other portion retains the alumiuiunrhydroxidr both liquors are then allowed to stand der the same conditions for is time. liquor Without the pre cigitate naturally is clear While the other one will clear up as the precipitate settles at the bottom of the container. If each of the iortions is non tested within a few days, one obtains the surgn-ising result that th liquor with the nrcipitate did not lose oxygen at all wher the other liquor,

" led of the precipitate by filtering, has

. all of its active oxygen. This stabilizell'ect of insoluble aluminium-com- 80. pounds prevails at low as Well as at high temperatures and the more important as it protects hydrogen peroxid solutions against decomposition no matter whether they are pure or Whether they contain impurities, as for instance, manganese-compounds, which usually are considered to be agents accelerating decomposition.

If it is preferred to make a solution containing active oxygen, from a solid su 'b stance, as for instance, sodium perborate, the alum may be directly added to the solid perborate thus obtaining the insoluble aluminium compound immediately on making the solution.

lV-here I refer in the claims to the submitting of a solution of a per-salt or of a perborate to the action of an insoluble aluminium compound, I meanvto include said solution and said insoluble compound hoW- we ever prepared, viz: Whether separately pre-- pared and subsequently brought together or whether the insoluble aluminium compound is formed Within the solution, or Whether a solid per-salt or perborate is mixeditm gather with a solid soluble aluminium compound and dissolved to form the desired insoluble aluminiuln' compound,

What I claim and desire to secure by Letters Patent is 1. The method. of rendering a solution containing-active oxygen stable which consists in submitting a non-acid solution containing active oxygen to the action of an insoluble aluminium compound.

h 2. The method of rendering a solution containing hydrogen peroxid' stable which consists in submitting a. non-acid solution of hydrogen peroxid to the action of an insoluble aluminium compound. Y

3. A stabillzed solution containing active oxygen comprising as an end product a solution of neutral or alkaline reaction con- ALOIS SCHAIDHAUF.

Witnesses EMIL SCHELLER, LUDWIG GATSNER. 

